Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| Ashwagandha (KSM-66) | Schisandra (Schisandra chinensis) | |
|---|---|---|
| Category | Adaptogens | Adaptogens |
| Standard Dose | 600mg KSM-66 daily (300mg 2x/day) | 500-1000mg daily (standardized to >2% schisandrins) |
| Timing | Morning and evening with meals. Evening dose supports sleep quality via cortisol reduction. | Morning or split AM/PM. With meals. |
| Cycle Duration | Cycle 8-12 weeks on, 2-4 weeks off (to prevent adaptogenic tolerance) | Cycle 8-12 weeks on, 2-4 weeks off |
| Evidence Level | strong_human | moderate_human |
Ashwagandha's primary bioactives are withanolides (particularly withaferin A and withanolide D). KSM-66 is a full-spectrum root extract standardized to >5% withanolides. It modulates the HPA axis by reducing cortisol output (20-30% reduction in trials), likely through GABAergic activity (withanolides are GABA-mimetic at GABA-A receptors) and by normalizing cortisol receptor (GR) sensitivity. It also inhibits the NMDA-induced neurotoxicity pathway, enhances DHEA-S production, promotes thyroid function (increases T4 to T3 conversion), upregulates antioxidant enzymes (SOD, catalase, glutathione peroxidase), and has demonstrated sirtuin-activating properties.
600mg KSM-66 daily (300mg 2x/day)
Morning and evening with meals. Evening dose supports sleep quality via cortisol reduction.
Cycle 8-12 weeks on, 2-4 weeks off (to prevent adaptogenic tolerance)
Schisandra berries contain lignans (schisandrin A, B, C; gomisin A, N) that are the primary bioactives. Schisandrin B is a potent inducer of hepatic Phase I (CYP450) and Phase II (glutathione S-transferase, UDP-glucuronosyltransferase) detoxification enzymes. Schisandra activates Nrf2/ARE pathway, increases glutathione synthesis, and has hepatoprotective effects by stabilizing hepatocyte membranes. It modulates the HPA axis, reduces cortisol, enhances mental performance under stress via cholinergic and catecholaminergic modulation, and improves mitochondrial function through enhanced cytochrome c oxidase activity.
500-1000mg daily (standardized to >2% schisandrins)
Morning or split AM/PM. With meals.
Cycle 8-12 weeks on, 2-4 weeks off
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